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MAX1953, MAX1954, MAX1957

Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers
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Status Explanations for product status codes

Active: In Production.

Description

The MAX1953/MAX1954/MAX1957 is a family of versatile, economical, synchronous current-mode, pulse-width modulation (PWM) buck controllers. These step-down controllers are targeted for applications where cost and size are critical.

The MAX1953 operates at a fixed 1MHz switching frequency, thus significantly reducing external component size and cost. Additionally, excellent transient response is obtained using less output capacitance. The MAX1953 operates from low 3V to 5.5V input voltage and can supply up to 10A of output current. Selectable current limit is provided to tailor to the external MOSFETs' on-resistance for optimum cost and performance. The output voltage is adjustable from 0.8V to 0.86VIN.

With the MAX1954, the drain-voltage range on the high- side FET is 3V to 13.2V and is independent of the supply voltage. It operates at a fixed 300kHz switching frequency and can be used to provide up to 25A of output current with high efficiency. The output voltage is adjustable from 0.8V to 0.86VHSD.

The MAX1957 features a tracking output voltage range of 0.4V to 0.86VIN and is capable of sourcing or sinking current for applications such as DDR bus termination and PowerPC®/ASIC/DSP core supplies. The MAX1957 operates from a 3V to 5.5V input voltage and at a fixed 300kHz switching frequency.

The MAX1953/MAX1954/MAX1957 provide a COMP pin that can be pulled low to shut down the converter in addition to providing compensation to the error amplifier. An input undervoltage lockout (UVLO) is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFETs from overheating. Internal digital soft-start is included to reduce inrush current. The MAX1953/MAX1954/MAX1957 are available in tiny 10-pin µMAX packages.
 

Data Sheet

Download this datasheet in PDF formatDownload Rev 0 (PDF, 444kB)
Send this datasheet to any email addressE-Mail
An evaluation kit is available: MAX1953EVKIT

Key Features

  • Low-Cost Current-Mode Controllers
  • Fixed-Frequency PWM
  • MAX1953
    • 1MHz Switching Frequency
    • Small Component Size, Low Cost
    • Adjustable Current Limit
  • MAX1954
    • 3V to 13.2V Input Voltage
    • 25A Output Current Capability
    • 93% Efficiency
    • 300kHz Switching Frequency
  • MAX1957
    • Tracking 0.4V to 0.86VIN Output Voltage Range Sinking and Sourcing Capability of 3A
  • Shutdown Feature
  • All N-Channel MOSFET Design for Low Cost
  • No Current-Sense Resistor Needed
  • Internal Digital Soft-Start
  • Thermal Overload Protection
  • Small 10-Pin µMAX Package
 

Applications/Uses

  • Graphic Cards and Video Cards
  • Low-Voltage Distributed Power
  • Microprocessor Core Supplies
  • PCs and Servers
  • Printers and Scanners
  • Telecommunications and Networking
   

Key Specifications:

Step-Down Switching Regulators
Part Number VIN
(V)		 VIN
(V)		 VOUT
(V)		 VOUT
(V)		 Max. IOUT
(A)		 Max. IOUT
(A)		 Output Adjust. Method DC-DC Outputs Oper. Freq.
(kHz)		 Package/Pins Smallest Available Pckg.
(mm2)		 Budgetary Price
min max min max ≥ ≤ max w/pins See Notes
MAX1953  3 5.5 0.8 4.5 4 4 Resistor 1 1000
µMAX/10
 15.4 $1.18 @1k
MAX1954  13.2 0.8 25 25 300
µMAX/10
 $1.07 @1k
MAX1957  5.5 0.4 3 3 300
µMAX/10
 $1.14 @1k
See All Step-Down Switching Regulators (284)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


Diagram

MAX1953, MAX1954, MAX1957: Functional Diagram
Functional Diagram

Application Notes

Application Note 1044   Design of Graphic Chip and Related Circuitry Power Supplies Using MAX1953 1MHz PWM Step-down Controller
Application Note 1045   One Megahertz Adaptable Power Supply Meets XENPAK MSA Specification
Application Note 1775   Power Supply for DDR-SDRAM Termination Operates From 3V to 5.5V Input
Application Note 1781   Graphics Chip Supply Delivers 1.65V at 26A
Application Note 3645   Correct Board Layout Lowers EMI of Switchmode Converters
Application Note 4992   Reduce the Chances of Human Error: Part 1, Power and Ground

Reliability Reports

Reliability Report: MAX1953.pdf MAX1954.pdf MAX1957.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX1953EUB    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX1953EUB+  
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX1953EUB+T    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX1953EUB-T    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX1954BEUB    
Active uMAX;10 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1954BEUB+    
Active uMAX;10 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1954BEUB+T    
Active uMAX;

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1954BEUB-T    
Active uMAX;

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1954CEUB    
Active uMAX;10 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1954CEUB+    
Active uMAX;10 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX1954CEUB+T    
Active uMAX;

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1954CEUB-T    
Active uMAX;

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX1954EUB    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX1954EUB+  
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX1954EUB+T    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX1954EUB-T    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX1954EVKIT    
Active KIT;

Land Pattern: Not Available

See data sheet
MAX1957EUB    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX1957EUB+  
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX1957EUB+T    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX1957EUB-T    
Active µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

Notes:
  1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
  2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
  3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
  4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX1953EVKIT Evaluation Kit for the MAX1953/MAX1954

Products with Similar Part Numbers

MAX1953EVKIT Evaluation Kit for the MAX1953/MAX1954
MAX1954AEVKIT Evaluation Kit for the MAX1954A
MAX1954A Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit

More Information

New Product Press Release [ 2002-06-03 ] [ 2002-05-09 ] [ 2002-05-07 ]
Power Supply Cookbook MAX1953, MAX1954, MAX1957


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Description
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Document Ref.: 19-2373 Rev 0; 2002-06-12
This page last modified: 2010-05-11

 


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